Merge branch 'stable'
Promote to 0.2.2-SNAPSHOT
Update readme
Delete MappedDataFileDeserializer, because it can't handle large files
New class for caching DataFile contents
Split list cache into mutable and immutable versions
A test for ImmutableCacheList
Fix deserializer, cache
Reversion to 0.2.2
Merge branch 'release/0.2.2' into stable